You cannot run another modem on BT? other customers do so.
I have a number of spare VDSL modems (8-)
I could take a HG612 down there, but I had been intending to move to A&A anyway.
Working IPTV is a nicety, not a necessity.
Otherwise, pfSense is far better as a firewall than anything I have personally controlled. Admittedly, its power and flexibility may be daunting to many.